If the numbers are not ascending left to right in Columns E:K, and you need them in the order they occur then try this.
In A2
Confirm with Ctrl+Shift+Enter not just Enter Before dragging Across and Down.
Formula:
=IFERROR(INDEX(2:2,1,SMALL(INDEX(IF(ISNUMBER($E2:$K2),COLUMN($E2:$K2),""),1,),COLUMNS($A:A))),"")
Note
Your profile is 2003 but the workbook you supplied is 2007 or above.
If you need this to work with 2003 then use this CSE array formula
Formula:
=IF(ISERROR(INDEX(2:2,1,SMALL(INDEX(IF(ISNUMBER($E2:$K2),COLUMN($E2:$K2),""),1,),COLUMNS($A:A)))),"",INDEX(2:2,1,SMALL(INDEX(IF(ISNUMBER($E2:$K2),COLUMN($E2:$K2),""),1,),COLUMNS($A:A))))
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